Submission #482409

#	Time	Username	Problem	Language	Result	Execution time	Memory
482409		Spade1	Dreaming (IOI13_dreaming)	C++17	Compilation error	0 ms	0 KiB

dreaming

#include <bits/stdc++.h>
#define ll long long
#define pii pair<int, int>
#define st first
#define nd second
using namespace std;

vector<pii> adj[100010];
vector<pii> connect;
bool visited[100010];

int max_dis, min_dis;
int u, v, node;

void dfs(int i, int prt, int dis) {
    visited[i] = 1;
    if (dis > max_dis) {
        u = i;
        max_dis = dis;
    }
    for (auto j : adj[i]) {
        if (j.st == prt) continue;
        dfs(j.st, i, dis + j.nd);
    }
}

int dfs2(int i, int prt, int dis) {
    if (i == v) {
        min_dis = dis;
        return 0;
    }
    for (auto j : adj[i]) {
        if (j.st == prt) continue;
        int k = dfs2(j.st, i, dis + j.nd);
        if (k == -1) continue;
        k += j.nd;
        if (max(dis, k) < min_dis) {
            node = i;
            min_dis = max(dis, k);
        }
        return k;
    }

    return -1;
}

int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
    for (int i = 0; i < M; ++i) {
        adj[A[i]].push_back({B[i], T[i]});
        adj[B[i]].push_back({A[i], T[i]});
    }

    int mx1 = INT_MIN, mx2 = INT_MIN;

    for (int i = 0; i < N; ++i) {
        if (visited[i]) continue;
        max_dis = 0, u = i;
        dfs(i, -1, 0);
        max_dis = 0, v = u;
        dfs(v, -1, 0);
        min_dis = INT_MAX, node = u;
        dfs2(u, -1, 0);
        connect.push_back({min_dis, node});
    }

    sort(connect.begin(), connect.end());

    for (int i = 1; i < connect.size(); ++i) {
        adj[connect[i].nd].push_back({connect[i - 1].nd, L});
        adj[connect[i - 1].nd].push_back({connect[i].nd, L});
    }

    max_dis = 0, u = 0;
    dfs(0, -1, 0);
    max_dis = 0;
    dfs(u, -1, 0);
    return max_dis;
}

int main() {
    int n, m, l; cin >> n >> m >> l;
    int a[m], b[m], t[m];
    for (int i = 0; i < m; ++i) {
        cin >> a[i] >> b[i] >> t[i];
    }
    cout << travelTime(n, m, l, a, b, t);
    return 0;
}

/*
12 8 2
0 8 4
8 2 2
2 7 4
5 11 3
5 1 7
1 3 1
1 9 5
10 6 3

15 10 5
0 1 1
1 11 2
1 2 4
2 4 6
9 10 5
10 12 10
3 7 6
6 7 6
7 8 9
8 13 8
*/

Compilation message (stderr)

dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:68:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |     for (int i = 1; i < connect.size(); ++i) {
      |                     ~~^~~~~~~~~~~~~~~~
dreaming.cpp:53:9: warning: unused variable 'mx1' [-Wunused-variable]
   53 |     int mx1 = INT_MIN, mx2 = INT_MIN;
      |         ^~~
dreaming.cpp:53:24: warning: unused variable 'mx2' [-Wunused-variable]
   53 |     int mx1 = INT_MIN, mx2 = INT_MIN;
      |                        ^~~
/usr/bin/ld: /tmp/ccXuFLFf.o: in function `main':
dreaming.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc0192Ae.o:grader.c:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc0192Ae.o: in function `main':
grader.c:(.text.startup+0xd1): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status